Peter Fonagy: What Is ‘Mentalization’?
Danielle Trudeau, MA
Summary: Mentalization, as defined by Peter Fonagy, is the ability to understand the thoughts and feelings of others by imagining their inner experiences. This essential human capacity supports empathy and emotional regulation, especially in therapy for borderline personality disorder, and begins in early caregiver relationships that reflect and name emotional states.
Let’s say you just watched your partner stub their toe. What’s your immediate response to that? You probably cringed at the thought, or said to yourself, “Ouch! That would be awful!” But what is awful about that image for you? You are not the one stubbing your toe—you are safe on the other side of the room, watching it happen. The reason it’s a painful thought is that, without having to stub your toe yourself, you can imagine what pain it would cause your partner. You can understand without them telling you that it wasn’t their intention to do it, and that stubbing their toe might be a source of quite a lot of feelings for them, not just physical pain, but also frustration, surprise, and maybe embarrassment.
This wordless, mindful interchange is uniquely human. The ability to think about what might be in other people’s minds (the skill of putting ourselves in another person’s experience) is something the Hungarian-born psychoanalyst Peter Fonagy calls mentalization. This concept is especially significant in clinical psychology, where understanding a person’s internal world is fundamental for treatment. Simply put, Fonagy describes mentalization as “having one’s mind in mind.”
Fonagy’s research, widely supported in language sciences and medical sciences, describes this capacity to imagine other people’s minds as something even more complex than empathy. Empathy, according to Fonagy, is something you can feel for a person, based on your capacity to imagine what the other person is feeling. That capacity, however, that imagining of the other person’s experience that elicits your empathy—is mentalization.
In treatment models such as mentalization-based treatment, especially when working with patients diagnosed with borderline personality disorder, this skill becomes a cornerstone of therapeutic practice. In fact, mentalization-based treatment has been shown to significantly help individuals with borderline personality disorder better understand and regulate their emotions through developing their capacity to reflect on the mental states of themselves and others.
This therapeutic approach is increasingly recognized by organizations such as the British Psychological Society, the British Academy, and within clinical psychology programs across institutions. It reflects the growing alignment of medical sciences and language sciences in exploring how early interpersonal experiences shape adult mental health.
Empathy is a feeling that comes from being able to say, “If this were me, I would feel this way.” During an instance in which you see your partner stub their toe, chances are you will utter something like “Ouch!” or “Oh no!” based purely on your understanding that if it had been your toe, you’d be in a lot of pain. Because of your own self-knowledge, you are able to mentalize your partner’s experience—that they have stubbed their toe, that it was not their intention to stub their toe, and that it probably hurt a lot, in a lot of different ways (i.e. frustration, surprise, embarrassment).
This capacity for mentalization is also deeply rooted in early attachment, particularly within the field of infant mental health, where a caregiver’s ability to reflect the child’s emotional states contributes to emotional regulation and secure attachment. Many studies, often cited by the British and Irish Group working in infant mental health, emphasize how foundational these interactions are.
As our understanding of borderline personality disorder expands, the integration of insights from language sciences, medical sciences, and institutions like the British Academy points to a more holistic approach to mental well-being. This interdisciplinary focus also reinforces the importance of training clinicians in mentalization-based treatment and ensuring they are supported by leading research bodies such as the British Psychological Society and the British and Irish Group.
Development of Mentalization Through Early Caregiver Interactions
Fonagy argues that this self-knowledge gets developed very early in life via our relationships with the adults who are caring for us. Much in the same way we can say “Ouch!!” when we see our partners stub their toe, our caretakers likely said “Ouch!” when they saw us fall, bump our heads, or scrape our knees.
Similarly, our caretakers were also there to name our feelings for us when we felt angry, disappointed, overjoyed, or scared. This is a deeper and much more nuanced example of mentalization, even than wincing when we watch someone sustain a minor injury. Mentalizing what might be happening in another person’s mind during a moment of real distress—anger, fear, misunderstanding, loneliness—is a skill we develop as our needs and capacities for interaction deepen.
When we’re babies, our caretakers do a lot to manage our anxieties around being fed, being changed, and being comforted; as we grow, we learn that our parents can also understand and name our mixed emotions: the sadness in our anger, the need for attention in our acting out, to name just two of myriad examples. Our caretakers’ ability to name our complex emotional experience demonstrated to us that what is in our minds can be captured inside others’ minds. Because someone could identify our feelings for us, this helped us develop the capacity to recognize our own feelings. And because our caretakers were able to name our feelings for us, our comprehension of others’ minds and experiences comes from that developed knowledge about how we have felt and would feel.
The more in tune to ourselves we can be, the more understood we can make ourselves. But this basic understanding of ourselves came from our caretakers’ ability to mentalize our experience and put it into words for us. So it becomes a real feedback loop: we are understandable to others, which makes us understandable to ourselves, which makes us even more understandable to others.
Of course, what’s being described here is the feedback loop in good working order. So often, our feelings have not been validated, and we have been left feeling misunderstood and alone. Psychotherapy can be a profound experience because it is a deep exercise in mentalization. By having a space to think and talk and express what’s on your mind, you become accessible to yourself in a new and eye-opening way, and your therapist is there to provide the very important experience of being understood. This, as mentalization goes, can help you more complexly understand yourself. Peter Fonagy believes that mentalization plays an enormous role in the healing process of psychotherapy, but on an even larger level, it plays a uniquely important and intensely intrinsic role in the way we are human together, not only with each other but also with ourselves.
Key Concepts in Fonagy’s Mentalization Theory
At the core of Fonagy’s theory is the idea that mentalization is more than empathy. It is the awareness that others have minds with thoughts, intentions, and emotions. He emphasizes that this skill develops through secure relationships, underpins emotional regulation, and forms the basis of many therapeutic approaches, including mentalization-based treatment.
Development of Mentalizing
Mentalizing emerges in early childhood through consistent, attuned interactions with caregivers. When adults reflect a child’s emotions accurately, the child learns that their feelings are real, nameable, and shared. This process builds the foundation for understanding others’ internal states later in life, forming the roots of empathy, connection, and psychological resilience.
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